|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | 36.61 | 28.92 |
| 1987 | 38.80 | 24.85 |
| 1988 | 36.68 | 25.27 |
| 1989 | 26.01 | 21.86 |
| 1990 | 25.12 | 20.36 |
| 1991 | 24.87 | 19.09 |
| 1992 | 34.77 | 28.97 |
| 1993 | 28.23 | 25.75 |
| 1994 | 23.62 | 29.88 |
| 1995 | 25.73 | 30.89 |
| 1996 | 23.88 | 30.08 |
| 1997 | 20.16 | 24.44 |
| 1998 | 18.67 | 23.85 |
| 1999 | 16.34 | 23.86 |
| 2000 | 21.11 | 27.41 |
| 2001 | 16.60 | 22.58 |
| 2002 | 14.83 | 22.25 |
| 2003 | 15.69 | 24.84 |
| 2004 | 15.32 | 26.25 |
| 2005 | 17.02 | 25.77 |
| 2006 | 15.29 | 28.95 |
| 2007 | 14.76 | 31.03 |
| 2008 | 12.25 | 21.52 |
| 2009 | 11.88 | 20.01 |
| 2010 | 7.99 | 18.49 |
|
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